Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955 (2009)
Moe, Maxwell, Arav, Nahum, Bautista, Manuel A., Korista, Kirk T.
We present a detailed analysis of the Astrophysical Research Consortium 3.5 m telescope spectrum of QSO SDSS J0838+2955. The object shows three broad absorption line (BAL) systems at 22,000, 13,000,...
X-Ray Absorption Analysis of MCG-6-30-15: Discerning Three Kinematic Systems (2009)
Holczer, Tomer, Behar, Ehud, Arav, Nahum
By analyzing the X-ray spectrum of MCG-6-30-15 obtained with the HETG spectrometer on board the Chandra Observatory, we identify three kinematically distinct absorption systems; two outflow...
Variable Intrinsic Absorption in Mrk 279 (2008)
Scott, Jennifer E., Arav, Nahum, Gabel, Jack R., Kriss, Gerard A., Quijano, Jessica Kim, Kaastra, Jelle S., ...
We examine the variability in the intrinsic absorption in the Seyfert 1 galaxy Mrk 279 using three epochs of observations from the Far Ultraviolet Spectroscopic Explorer (FUSE) and two epochs of...
Measuring Column Densities in Quasar Outflows: VLT Observations of QSO 2359-1241 (2008)
Arav, Nahum, Moe, Maxwell, Costantini, Elisa, Korista, Kirk T., Benn, Chris, Ellison, Sara
We present high resolution spectroscopic VLT observations of the outflow seen in QSO 2359-1241. These data contain absorption troughs from five resonance Fe II lines with a resolution of ~7 km/s and...
Physical Conditions in Quasar Outflows: VLT Observations of QSO 2359-1241 (2008)
Korista, Kirk, Bautista, Manuel, Arav, Nahum, Moe, Maxwell, Costantini, Elisa, Benn, Chris
We analyze the physical conditions of the outflow seen in QSO 2359-1241 (NVSS J235953-124148), based on high resolution spectroscopic VLT observations. This object was previously studied using...
CHEMICAL ABUNDANCES IN AN AGN ENVIRONMENT: X-RAY/UV CAMPAIGN ON THE MARKARIAN 279 OUTFLOW (2007)
Arav, Nahum, Gabel, Jack R., Korrista, Kirk T., Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, ...
We present the first reliable determination of chemical abundances in an active galactic nucleus (AGN) outflow. The abundances are extracted from the deep and simultaneous Far Ultraviolet...
HUBBLE SPACE TELESCOPE ULTRAVIOLET SPECTROSCOPY OF 14 LOW-REDSHIFT QUASARS (2007)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low-redshift (zem ≤ 0:8) quasars observed with the Hubble Space Telescope STIS as part of a Snapshot project to understand the relationship...
Chemical Abundances in AGN Environment: X-Ray/UV Campaign on the MRK 279 Outflow (2006)
Arav, Nahum, Gabel, Jack R., Korista, Kirk T., Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, ...
We present the first reliable determination of chemical abundances in an AGN outflow. The abundances are extracted from the deep and simultaneous FUSE and HST/STIS observations of Mrk 279. This data...
Arav, Nahum, Kaastra, Jelle, Costantini, Elisa
A recent manuscript posted on astro-ph (astro-ph/0611578) by Fields et al. (hereafter F06) reports evidence of supersolar metal abundances in Mrk 279 by analyzing its Chandra LETGS X-ray spectrum. We...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, L. Aldcroft, Thomas, ...
We present low-resolution ultraviolet spectra of 14 low redshift (z em < 0.8) quasars observed with HST/STIS as part of a Snap project to understand the relationship between quasar outflows and...
Hubble Space Telescope Ultraviolet Spectroscopy of Fourteen Low-Redshift Quasars (2006)
Ganguly, Rajib, Brotherton, Michael S., Arav, Nahum, Heap, Sara R., Wisotzki, Lutz, Aldcroft, Thomas L., ...
We present low-resolution ultraviolet spectra of 14 low redshift (z
The AGN Outflow in the HDFS Target QSO J2233-606 from a High-Resolution VLT/UVES Spectrum (2006)
Gabel, Jack R., Arav, Nahum, Kim, Tae-Sun
We present a detailed analysis of the intrinsic UV absorption in the central HDFS target QSO J2233-606, based on a high-resolution, high S/N (~25 -- 50) spectrum obtained with VLT/UVES. This spectrum...
Gabel, Jack R., Arav, Nahum, Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, Costantini, Elisa, ...
We present an analysis of the intrinsic UVabsorption in the Seyfert 1 galaxy Mrk 279 based on simultaneous long observations with the Hubble Space Telescope (41 ks) and the Far Ultraviolet...
Gabel, Jack R., Arav, Nahum, Kaastra, Jelle S., Kriss, Gerard A., Behar, Ehud, Costantini, Elisa, ...
We present an analysis of the intrinsic UV absorption in the Seyfert 1 galaxy Mrk 279 based on simultaneous long observations with the Hubble Space Telescope (41 ks) and the Far Ultraviolet...
X-ray/UV Campaign on the Mrk 279 AGN Outflow: Constraining Inhomogeneous Absorber Models (2004)
Arav, Nahum, Kaastra, Jelle, Kriss, Gerard A., Korista, Kirk T., Gabel, Jack, Proga, Daniel
We investigate the applicability of inhomogeneous absorber models in the formation of AGN outflow absorption-troughs. The models we explore are limited to monotonic gradients of absorbing column...
Scott, Jennifer E., Kriss, Gerard A., Lee, Julia C., Arav, Nahum, Ogle, Patrick, Roraback, Kenneth, ...
We present a study of the intrinsic X-ray and far-ultraviolet absorption in the Seyfert 1.5 galaxy Markarian 279 using simultaneous observations from the Chandra X-ray Observatory, the Space...
Outflows vs. Clouds in AGN Intrinsic Absorbers (2003)
We discuss the crucial role of a dynamical picture in the analysis of AGN intrinsic absorbers data. High quality FUSE data of Mrk 279 are used to demonstrate that the line of sight covering fraction...
Contrasting the UV and X-ray O VI Column Density Inferred for the Outflow in NGC 5548 (2003)
Arav, Nahum, Kaastra, Jelle, Steenbrugge, Katrien, Brinkman, Bert, Edelson, Rick, Korista, Kirk T., ...
We compare X-ray and UV spectroscopic observations of NGC 5548. Both data sets show O VI absorption troughs associated with the AGN outflow from this galaxy. We find that the robust lower limit on...
AGN Outflows: Analysis of the Absorption Troughs (2002)
With the advent of Chandra and XMM, X-ray lines spectroscopy of AGN outflows is off to an exciting start. In this paper we illuminate some of the complications involved in extracting the outflow's...
On the Column Density of AGN Outflows: the Case of NGC 5548 (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T.
We re-analyze the HST high resolution spectroscopic data of the intrinsic absorber in NGC 5548 and find that the C IV absorption column density is at least four times larger than previously...
HST STIS Observations of PG 0946+301: the Highest Quality UV Spectrum of a BALQSO (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T., Crenshaw, D. Michael, Van Breugel, Wil, Brotherton, Michael, ...
We describe deep (40 orbits) HST/STIS observations of the BALQSO PG 0946+301 and make them available to the community. These observations are the major part of a multi-wavelength campaign on this...
Photoionization Models for BALQSO PG 0946+301 (2001)
Arav, Nahum, De Kool, Martijn, Korista, Kirk T.
This is a companion paper to the manuscript entitled: ``HST STIS Observations Of PG 0946+301: The Highest Quality UV Spectrum of a BALQSO'' (Arav et al. 2001; accepted for publication in ApJ). Here...
Keck Hires Observations of the QSO First J104459.6+365605: Evidence for a Large Scale Outflow (2000)
De Kool, Martijn, Arav, Nahum, Becker, Robert H., Gregg, Michael D., White, Richard L., Laurent-Muehleisen, Sally A., ...
This paper presents an analysis of a Keck HIRES spectrum of the QSO FIRST J104459.6+365605. The line of sight towards the QSO contains two clusters of outflowing clouds that give rise to broad blue...
Brotherton, M. S., Arav, Nahum, Becker, R. H., Tran, Hien D., Gregg, Michael D., White, R. L. ., ...
We report the discovery of a bright quasar (E=15.8, z=0.868) associated with the flat spectrum radio source NVSS J235953-124148. This quasar we designate QSO 2359-1241 possesses a rare combination of...
The Intrinsic Absorber in QSO 2359-1241: Keck and HST Observations (2000)
Arav, Nahum, Brotherton, Michael S., Becker, Robert H., Gregg, Michael D., White, Richard L., Price, Trevor, ...
We present detailed analyses of the absorption spectrum seen in QSO 2359-1241 (NVSS J235953-124148). Keck HIRES data reveal absorption from twenty transitions arising from: He I, Mg I, Mg II, Ca II,...
What Determines the Depth of BALs? Keck HIRES Observations of BALQSO 1603+300 (1999)
Arav, Nahum, Becker, Robert H., Laurent-Muehleisen, Sally A., Gregg, Michael D., White, Richard L., De Kool, Martijn
We find that the depth and shape of the broad absorption lines (BALs) in BALQSO 1603+3002 are determined largely by the fraction of the emitting source which is covered by the BAL flow. In addition,...
HST Observations of the Broad Absorption Line Quasar PG 0946+301 (1998)
Arav, Nahum, Korista, Kirk T., De Kool, Martijn, Junkkarinen, Vesa T., Begelman, Mitchell C.
We analyze HST and ground based spectra of the brightest BALQSO in the UV: PG~0946+301. A detailed study of the absorption troughs as a function of velocity is presented, facilitated by the use of a...
PG 0946+301: the Rosetta Stone of BALQSOs? (1998)
We describe the motivation and features of a multiwavelength spectroscopic campaign on broad absorption line (BAL) QSO PG~0946+301. The main goal of this project is to determine the ionization...
Arav, Nahum, Barlow, Thomas A., Laor, Ari, Sargent, Wallace L. W., Blandford, Roger D.
We search for a direct signature of discrete ''clouds'' in the broad line region (BLR) of the Seyfert galaxy NGC 4151. For this purpose we apply cross correlation (CC) analysis to a high resolution...
What is the redshift of gamma-ray burst 970508? (1997)
A Bayesian likelihood analysis is used to constrain the redshift of the optical transient associated with gamma-ray burst 970508, under the assumption that the absorption at redshift 0.835 is not...
Studies in radiation hydrodynamics / (1994)
Thesis (Ph. D.)--University of Colorado, 1994.